Improvement in rufflers for sewing-machines



UNITED STATES PATENT OFFICE,

WILLIAM H. LEWITI, OF ST. LOUIS, MISSOURI.

IMPROVEM;ENT IN RUFFLERS FOR SEWlNG-MACHINES.

Specification forming art of Letters Patent N0. 154,497, dated August25, 1874 applioation filed Deoember 18, 1873.

wirh a temper-sorew, through whioh the lever aots upon tl1eruffler-plate with an effeot vari- .alole by the adju'stment of seid.sorew.

In the drawings, Figure 1 is a top perspeetive view; am]. Fig. 2 is abottom perspeotive view, .With parts 0f the cloth-plate broken away.

A1's the olofoh-plate B, the front shuttle-race cover; O, the slidingruf'fler-plate Witl1 guide. screws 0r studs, D, and c-arrying agatherer, E. G is the shuttle-drlver slide, and F tl1e arm by which itis operated.

All ehe above parts l1ave a similar consruotion to those in t-heaforesaid patent, N0. 140,- 285,a11d as used by the Howe sewing-maohine.

The leverH in tl1e present improvement lxas a shoe, I, provided witl1two proj eetions, 11 i, against whioh the bar g of the shuttle-driverslide aots to vibrate tl1e lever H. The ends k k aot es stops 130 limitthe vibration of the lever H by impact aga-inst the bottom of thecloth-plate A. The end k also aots es a weigl1t tending to hold the topof the lever H a-gainst ehe rounded point of the 'temper-sorew J bypressure, against wl1ich the slide O is moved back ward from the needle.The serew J turns in a stud, K, fixed on the top of the plate O.

'lhe slide-plate 0 is moved in the opposite direotiontliat is, forwardbya projeotio u L,

causes the baokward movement of tl1e slide, if the sorew is turnedbaokward so as to lessen the projeotion 0f its point j from the stud. K,it is evident thal: the slide would not be 0erried so far baokward and.the tmvel of the slide would loe deereased. 011 the otl1er band, if thescrew J is turned forward so filmt its point projeots farther from thestud the travel of tl1e slide O is iuoreased. Tl1e lever osoillates on afulorum-sorew, M, 011 whieh is a washer, N, whose periphery is formedinto a nuu1ber of springs by angular slits extending inward from theedge, and then in a oiroumferenti a1 direotion, forming tongues, whichare ourved to one side, so es to have a bearing on ehe side of he leverH, and oheok its movement, except by the action of ehe bar gupon itsprojeotions i i. 011 t-l1e under side of Ehe plante B is a cam, O, whoselever P moves against the ratohet Q on the under side of the plate B.The purpose of this cum is 130 hold the plate B in place by pressureagainst the side of the opening a of t-l1e cloth-plate, in which theplate B Tests. 'll1e turnig of the cam-lever P to uhe left brings thesalient portion of tl1e cam with foroe against the side of a, and theoan1 is hold in this position by tl1e hold of tl1e ratchet Q upon ehelever. 'Ihe pressure-foot R has a ratohet-tooth on its loqyer side toprevent ehe material from being drawn back by tl1e retrograde motion ofthe gatherer E.

I olaim es my invention 'Il1e oombination of the shuttle-driver slide G,the lever H, having a shoe, I, profidecl With projeotions z z" and 70 k,seouring a positive and equal intermittent motion of tl1e lever, and thetemper-serew J, regulating the movement or travel of the rufflerslide-plate, zus set forth.

In festimony of Whiol1 invention I have sei: my hand hereunto.

WILLIAM H. LEWIT'I. Witnesses:

SAML. KNIGH'I, ROBERT Boxms.

